Bending-die.



No. 774,818. PATENTED NOV. 15, 1904.

. J.H.BARR.

BENDING DIES,

APPLICATION FILED no.5, 1903.

N0 MODEL.

WITNESSES: INVENTOR No. 774,818. I

Patented November 15, 1904.

UNITED STATES PATENT OEEIcE.

JOHN H. BARR, OF ALLEGHENY PENNSYLVANIA, ASSIGNOR OF ONE- HALF TOPITTSBURG FORGE AND IRON COMPANY, OF PITTSBURG, PENNSYLVANIA, ACORPORATION OF PENNSYLVANIA.

BENDING-DIE.

SPECIFICATION forming part of Letters Patent No. 774,818, dated November15, 1904. Application filed December 5, 1903. Serial No. 183,889. (Nomodel.)

To all whom it may concern.-

Be it known thatI, JOHN H. BARR, a citizen of the United States,residing at Allegheny, in the county of Allegheny and State ofPennsylvania, have invented or discovered certain new and usefulImprovements in Bending- Dies, of which improvements the following is aspecification.

The invention described herein relates to certain improvements in diesfor bending archbars, &c., for railway-trucks, and has for its object aconstruction of dies whereby they are maintained at a uniformtemperature during the bending of a number of bars.

It is a further object of the invention to provide for holding the blankin proper central position during the bending operation.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification,Figure l is a top plan of my improved dies; and Fig. 2is aseotionalelevation, the plane of section being indicated by the line II II, Fig.1.

In the practice of my invention the dies 1 and 2 are made in the form ofopen-topped boxes, as shown. One wall. as 3, of each of the box-likestructures is constructed to impart the desired shape or contour to thearticle. The necessary rigidity is given to the wall by transversepartition walls 4:. The chambers or pockets into which the dies aredivided by the partitions are connected by passages 5, formed throughthe partitions, as shown. WVater is supplied to the dies by pipes 6 andescapes through pipes 7, which are arranged vertically in one of thepockets. These pipes extend up a distance equal to the height of Waterdesired in the dies.

The male die 2 is provided at its ends with stop-plates 8. which havetheir inner faces so curved that the ends of the bar to be shaped willbear against said stops during the entire bending operation, therebypreventing any longitudinal movement of the bar. Without thesecentering-stops the bar is liable, especially if one end is hotter thanthe other, to move longitudinally during the bendingoperation. The die 2is provided with a supportlng or plate ledge 9, on which the article isI placed, and the other die 1 is provided with a holding-plate whichwill pass over the upper edge of the article as the dies are movedtoward each other. These two supporting and holding plates will preventany ed gewise bending of the bar and in conjunction with the stops 8hold the bar in such manner as to in sure that a series of bars will bebent uniformly. The maintenance of the dies at or approximately the sametemperature is necessary to uniformity of product, as if the dies shouldexpand or vary in length the ends of the bars would not bear on thestops and the bar could shift more or less longitudinally.

In order to prevent a rapid destruction of the dies, provision is madeto form the portions mostsubjected to wear of hardened-steel pieces 10,which are removably inserted into recesses formed in the wall 3 of thedies. In the construction shown these hardened wearing-pieces arearranged at angles or male por-' 2. Bending-dies consisting of box-likestructures, the shaping-faces thereof being formed by the sides of theboxes, in combination with stop-plates constructed to bear on both endsof the article operated'on during the bending operation, and havingtheir operative or inner faces curved to correspond to the arcsdescribed by the ends of the article during the bending operation, andsupporting and holding plates, substantially as set forth.

In testimony whereof I have hereunto set my hand.

JOHN H. BARR.

Witnesses:

DARWIN S. WoLcoTT, F. E. GAITHEE.

